GASCO - Advanced Training for Liquefied Gas Tanker Cargo Operations Exit Exam Questions - Set 6

Question 1

Onboard an LNG tanker, why is forced boil - off required out during loaded passage?

Accepted Answer

D: To supplement fuel supply to the main propulsion plant

Answer

A: To maintain cargo tank pressurees

Answer

B: To maintain cargo tank temperatures

Answer

C: To maintain cold temperature at the tripod mast

Question 2

If there is an interruption at the end of cooldown before loading, what is the recommended measure to be taken?

Accepted Answer

D: To continue cooldown process until the tank bottom close to -160°C.

Answer

A: To stop cooldown completely and open loading valv

Answer

B: To stop cooldown and close the vapor manifold

Answer

C: To start own spray pump and cool down

Question 3

What does the pressurizing the insulation spaces with nitrogen and maintaining a slightly higher pressure than the atmospheric pressure prevent?

Accepted Answer

A: Formation of explosive mixtures; ingress of moisture and air

Answer

B: Collapse of the inflated insulation boxes

Answer

C: Collapse of the inflated insulation boxes

Answer

D: Accidental formation of vacuum leading to membranee collaps

Question 4

Can ballast operations take place during custody transfer measurement?

Accepted Answer

C: No; all ballast operations should be suspended

Answer

A: Yes, ballasting should be done to maintain even keel

Answer

B: Ship should be maintained upright by ballasting

Answer

D: There are no restrictions on ballast operations

Question 5

What is the medium used for inerting cargo tanks?

Accepted Answer

B: Inert gas

Answer

A: Oxygen

Answer

C: Dry air

Answer

D: Methan

Question 6

What is the main reason for a membrane class LNG tanker to retain a small quantity of cargo ("heel") during ballast passage?

Accepted Answer

D: For cold maintenance of the cargo tanks

Answer

A: To ensure easy starting of cargo pump at loading port

Answer

B: To reduce the consumption of heavy fuel oil on passage

Answer

C: To avoid bottom of the cargo tank come into contact with oxygen

Question 7

Which equipment Is used for evacuating the Insulation spaces?

Accepted Answer

A: Vacuum pumps

Answer

B: HD blowers

Answer

C: LD blowers

Answer

D: Water ballast ejector

Question 8

Safety is dependent on orderliness and cleanliness. Order may be maintained by______.

Accepted Answer

A: storing items in their assigned plac

Answer

B: storing all items in a common storage container except those ready-for-sea

Answer

C: tagging all items according to their age and then storing them together

Answer

D: disposing of used items

Question 9

Oxygen in the atmosphere of the tank is used up when iron is converted into oxides during the corrosion process. ---------------i in the tanks prior to entry.

Accepted Answer

B: Space to have a minimum oxygen level for sustaining lif

Answer

A: Copious quantity of fresh air

Answer

C: Pressurized oxygen pumped

Answer

D: Space to be ventilated for 24 hours

Question 10

gas pressurizes the liquid out of the soda acid type- water extinguisher through the dip tube.

Accepted Answer

D: carbon-dioxid

Answer

A: hydrogen

Answer

B: oxygen

Answer

C: nitrogen

Question 11

A CO2 type-water extinguisher is used to fight class_____________ fires.

Accepted Answer

A: A

Answer

B: B

Answer

C: C

Answer

D: D

Question 12

is defined as the temperature of a substance that is required to heat the vapour in air to ignite spontaneously.

Accepted Answer

B: Auto-ignition temperatur

Answer

A: Flammable rang

Answer

C: Flash point

Question 13

What is the least you must do before entering a cofferdam in the engine room?

Accepted Answer

B: Complete an enclosed space checklist

Answer

A: Open up the manhole and enter the cofferdam

Answer

C: Enter the cofferdam and simultaneously start ventilation

Question 14

What is the range of expansion ratio for high expansion foams?

Accepted Answer

A: 1000:1

Answer

B: 5:1to 15:1

Answer

C: 1250 liters/min

Question 15

Which of these statements is correct?

Accepted Answer

A: Used primary cells have to be discarded

Answer

B: Used primary cells can be recharged

Answer

C: Used primary cells can be refilled and used.

Question 16

Good housekeeping on a vessel prevents fires by

Accepted Answer

B: eliminating potential fuel sources

Answer

A: allowing better access in an emergency

Answer

C: eliminating trip hazards

Answer

D: improving personnel qualifications

Question 17

On each LNG cargo tank two relief valves are fitted. Identify the correct combination of "set pressure" (lifting pressure) and "reseating pressure" for these valves.

Accepted Answer

A: 250 mbar and 220 mbar

Answer

B: 50 mbar and 20 mbar

Answer

C: 2.5 bar and 2.2 bar

Answer

D: 500 mbar and 200 mbar

Question 18

Advantages of reliquefaction plant on LNG tankships will not include,

Accepted Answer

C: Lower S0 and NO emissions

Answer

A: Total quantity of LNG loaded can be delivered to the customer

Answer

B: Reduction in heel required on ballast voyag

Answer

D: Proven technology and easy availability of crew

Question 19

What happens to the air leaving drying tower if the activated alumina inside cylindrical alumina inside cylindrical tank is "old" (inefficient)?

Accepted Answer

A: It will not be at required dew point

Answer

B: It will not be affected at all

Answer

C: It will not be warm enough

Answer

D: It will not be cold enough

Question 20

What is provided to ensure that the low duty gas compressor flow rate does not fall below the designed minimum?

Accepted Answer

B: An automatic surge control system

Answer

A: An automatic shut down system

Answer

C: An automatic venting system

Answer

D: An automatic start system

Question 21

_____________operates by splitting air into its component gases by sending compressed air above hollow fibre membranes.

Accepted Answer

B: Air separation process

Answer

A: Air compression process

Answer

C: Air condensing process

Question 22

Onboard an LNG Tanker, while vaporizing during cargo discharge using the main vaporizer, what is the approximate desired outlet temperature of LNG vapour?

Accepted Answer

C: -10°C

Answer

A: -140°C

Answer

B: -130°C

Answer

D: -120°C

Question 23

There are typically two types of gas heaters onboard an LNG tanker. One is the main heater and which of the following options is the other?

Accepted Answer

B: Fuel gas heater (Boil - off gas heater)

Answer

A: IG heater

Answer

C: Nitrogen heater

Answer

D: Air heater

Question 24

A typical membrane method Nitrogen Generator's Air Compressor will trip when the following occur, EXCEPT

Accepted Answer

D: Air Compressor oxygen reading 20% by volum

Answer

A: Nitrogen storage tank pressuree high

Answer

B: Air Compressor oil separator pressuree high

Answer

C: Air Compressor oil separator inlet temperature high

Question 25

The following are the communication connection integrated in the ESDS fibre optic system, EXCEPT:

Accepted Answer

A: 1 connection satellite telephon

Answer

B: 1 hotline telephone (to terminal)

Answer

C: 1 public telephon

Answer

D: 1 normal telephone (to terminal)

Question 26

What is the purpose of having a level gauging system?

Accepted Answer

C: To get accurate tank levels for custody transfer and topping up

Answer

A: To avoid over pressureizing of cargo tanks during loading operation

Answer

B: To ensure tank cool down rate is maintained at required rat

Answer

D: To prevent sudden temperature change in the insulation spaces

Question 27

What is the type of gas detection system fitted for spaces with air?

Accepted Answer

A: Spot metering type fixed inside the individual insulation spaces

Answer

B: Infrared type using sequential measurement

Answer

C: Portable gas detection system due to mobility of this method

Answer

D: Catalytic combustion typ

Question 28

What is the "ESDS" abbreviation stands for?

Accepted Answer

C: Emergency shutdown system

Answer

A: Emergency shutdown deck system

Answer

B: Emergency system deck serial

Answer

D: Emergency downtime system

Question 29

How many suitable and operational portable gas detection equipment shall be available onboard?

Accepted Answer

A: At least two sets with methane gas detection capability

Answer

B: At least one with methane and one of carbon monoxides gas detection capability

Answer

C: At least one with methane gas and one of Ammonia gas detection capability

Answer

D: At least one with methane gas and one of propane gas detection capability

Question 30

What is the type of gas detection system fitted to monitor gas content of the insulation spaces?

Accepted Answer

B: Infrared type / sequential measurement

Answer

A: Continuous measurement system using catalytic combustion typ

Answer

C: Portable gas detection system due to mobility of this method

Answer

D: Spot metering type fixed inside the individual insulation spaces

Advanced Training for Liquefied Gas Tanker Cargo Operations (GASCO) (Set 6)

Onboard an LNG tanker, why is forced boil - off required out during loaded passage?

Questions in GASCO Set 6

Question Discussion & Notes

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